This MLB Adjust a Hit Tee Ball Set features a lightweight EVA base construction with durable PVC tee and Adjust a Hit technology, the tee adjusts from 21 inches to 30 inches in height with a simple twist and lock motion, a soft rubber foam barrel with adjust a hit  technology, the bat adjusts from 21 inches to 27 inches with a simple twist and lock motion, and a soft PU foam baseball.